如何在 IHttpActionResult 的响应正文中添加“代码”返回 BadRequest(Message)

Question

I am returning BadRequest("Failed Invalid Product Id"), which returns me Response code 400 and Response Body

{
    "error": {
    "code": "",
    "message": "Failed Invalid Product Id"
     }
}

How can I send the Response code 400 in the Response Body so I get Response Body Like:

{
    "error": {
    "code": 400,
    "message": "Failed Invalid Product Id"
     }
}

Answer 1

You can do something like this, with out testing it:

return Content((HttpStatusCode)400, "Failed Invalid Product Id");

If you really want to have customized way to do it than you need to extend IHttpActionResult implementation with your own class like the following example which is inspired from this link :

public class ErrorResult : IHttpActionResult
{
    private readonly Error _error;
    private readonly HttpRequestMessage _request;

    public ErrorResult(Error error, HttpRequestMessage request)
    {
        _error = error;
        _request = request;
    }

    public Task<HttpResponseMessage> ExecuteAsync(CancellationToken cancellationToken)
    {
        var err = new Error()
        {
            Code = _error.Code,
            Message = _error.Message
        };

        var response = new HttpResponseMessage(HttpStatusCode.BadRequest)
        {
            Content = new ObjectContent<Error>(err, new JsonMediaTypeFormatter()),
            RequestMessage = _request
        };
        return Task.FromResult(response);
    }
}

public class Error
{
    public string Code { get; set; }
    public string Message { get; set; }
}

Then to use it:

var err = new Error()
{
    Code = "400",
    Message = "Failed Invalid Product Id"
};

return new ErrorResult(err, Request);

This will error return: